mixing polyester resin with hardener

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=113314
Printed Date: May 11, 2025 at 6:08 PM

Topic: mixing polyester resin with hardener

Posted By: srsoupy
Subject: mixing polyester resin with hardener
Date Posted: April 21, 2009 at 9:13 AM

I picked up a can of bondo fiberglass resin. It came with the hardener.

Last night, I did a small test and mixed 1 oz resin: 12 drops MEKP
The problem is that while i am stirring the mixture it gelled up pretty fast but stays sticky.
Is this normal? should the resin with hardener gells when you stir the mixture?

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soupy

Replies:

Posted By: pintac420
Date Posted: April 22, 2009 at 2:31 AM

less hardener dude should do that when your done your first layer

Posted By: ckeeler
Date Posted: April 22, 2009 at 10:40 AM

waaayyyy too much MEKP there. back it off a little. the ambient air temp is also important as well. i.e your gonna use alot less MEKP in the summer than you would in the winter.

Posted By: bellsracer
Date Posted: May 07, 2009 at 4:17 PM

o_____o

Ease off the hardener... Just a lottle

If it is from Bondo, then there will be some basic instructions for how much to use. They also like to mark their hardeners with the relative amount needed for the job. ie Half the can is used, use half the hardener. But I do not recommend mixing more than a quart at any time. To be honest I do 1/2 quart mixes at most at a time. I would rather mix many smaller amounts that get fully used rather than mixing a larger batch and not being able to use some (or a lot) of it.

Ganbatte ne!

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